Rock-drill.



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PATENTBD 00T. so, 1906.

- 'I'.'E. ADAMS.

ROCK DRILL. ArrLIoA'TIon. rum) JULY-29.114,05..

NVENTO? Allo'rney I be operated 1'y y THQMAS'EDGAR l To all whom it may concern:

Be it known that I, THOMAS EDGAR ADAMS a resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented cer,-

Atain new and useful Improvements in Rock- Drills; and I do hereby declare the following to be a full,` clear, and exact description of the invention, such 'as will enable others skilled in the art to which it appertains to make and use the same. p

My invention relates to an improvement in. rock-drills, one object ofthe invention being to provide an improved drill in which 'compressed' air is employed as a cushioning connectin medium between operative parts of the dr'l and providingu an air-pump to by the drill, or otherwise if more i convenient, to maintain the air in the drills that the I, derstood nnprovement back door of the at a density that will insure the driven piston being moved in unison with the driving-piston, even though the drill-bit connected with the driven piston should stick in the hole'being drilled. y A further object is to provide valves suitabl arranged to control the ressure of air, an thereby control the lengt ofthe stroke drill-steels, of various weights require different densities-of the air-cushions to maintain the uniform length of stroke.

A further object is to so arrange the valves position of the. driven piston in the may be changed, it bei well unx` that in drilling upward t eweight of the reciprocating. arts gradually trends to move downward t ough the air-cushion until struck b the drivi -piston. In the ere shown can by increasmg the density of air between the pistons force the driven piston awayfrom the drivingpiston to a suitable distance.

ith these and other objects in view the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan view, and ig. 2 is a view 1n longitudinal cylinder section, illustrating my improvements; and

Flg. 3 1s a view in cross-section through the drill. Fig. 4 is a face view ofpiston."

-1 represents a drill-barrel provided in its forward end with a mounting for the drill-rod 2,'Whichmounting at its inner end, at least,

Specication of Letters Patent. Y v l Application sied July. ze, 1905.

` able back e driven piston, it being obviousy that 'ADAMsor CLEVELAND, oiiro. y i ROCK-DRILL.

Patented Oct. 30, 1906,. serial No. 271,906. .l l

is air-tight, and a. iston 3 is secured on the inner end of the rocllby'mearis of a key 3 and fits snugly in the barrel 1. Located in the rear end of the barrel is an perating crank-shaft` 4, en

ocks 5, forming a vertical y-reciprocating ox in a cross-head 6, movable in barrel 1, and arod V7, secured to cross-head bar, rojects through an air-tight partition 8 in arrel 1 and has a piston 9 secured on its forward end. I shall refer to the vchamber in frontvof piston 3 as chamber 10, the space between pistons 3 and 9 as chamber 11, and the space between piston 9 and partition 8 as chamber 12.

The drill-casing 1s provided with a removdoor 15, with a valvedinlet 15 for air to the crankcasing, or air may be admitted through a valve 15b on the crank-casing. The removo b b able b ack door 15 is provided with a pumpcylinder 13, having a plunger '14 therein connected to cross-head 6, and an opening 17 is provided in the pump-barrel to admit air om the crank-case into the pump-cylinder.

Above the pump, in the back door, two conical turnin lugs 18 -and 19 are located and are made o loW to receive check-valves 20, havingv tight lu s 20 to close the opening over the c veclvalve s rings. Short ducts 21 are rovided in the 1P connecting t e air-passage with ducts 22 and 23, respectively, in the drill-barrel, the duct 22 communicati with chamber 11, and the duct 23 directs t e air into a channel. 24, communicati bers 1() and 12, and a similar, c annel 25 is provided opposite to channel 24 to more peri ectly equalize the air-pressure and allow a more rapid movement of the air'.

The plug 19 has a handle 26 to permit the same to be manually turned to shut oiicommunication with the chambers 10 and '12, and a rod-springv 28 is connected at one end to the plug 18, and at its lower end located in any of a series of o en ings 29a in a web 29 on the back door. T is spring 28 will admit of ample torsion to permit its upper end to be operated to turn plug 18 and shut off communication with the turn the plug to its normal open position when released, and it also permits the plug to be raised by excessive air-pressure to maintain a proper density in the drill. .The plug 19 is provided in its lower portion With a port 30, normally closed, yet which can be aging bearing-I ugs 18 and 19,- Y rom the pump With cham- For convenience of description which may be providedv IOO 1o 5f chamber 11,but re- IIO moved to aline with a port 30 in the back door to permit the air from the pump to be returned to the drill-barrel.

The driven piston is provided with an annular chamber 31, connected by ports 32 with chamber 10, and a leather disk 33 serves as a Hap-valve for all of these ports. When the driven piston moves far enough forward to bring its chamber 81 over the outlets of channels 24 and 25, the air will enter chamber 31 and pass though ports 32 into chamber and drive the piston back.

The operation of my improvements is as follows: The air-pump forcing ,its air through ducts 22 and 23 compels a uniform air-pressure in'chambers 10, 11, and 12, so that when piston 9 is moved forward the air between the pistons 9 and 3 will act as a cushioning connection between them to drive the piston 3 and drill-rod forward, the air in advance of piston 3 passing through channels 24 and 25 to the chamber 12 between the partition 8 and piston 9, and the reverse stroke of piston 9 causes the air between the same and partition 8 to flow through channels 24 and 25 into chamber 10 and compel the piston 3\ to move back with piston 9. By this arrangement of parts the air not only serves as a connecting medium to drive the drill-rod, but also acts as a cushion to take the shock and vibration. By turning plug 18 to close its communication with duct 23 all the air will be forced between the pistons to separate them, and when plug 19 is closed and plug 18 open the air will be forced into chambers 10 and 12 to force the pistons toward each other, thus permitting the operator at all times to move the driven piston in any direction he may desire. A I

The air entering the drill is preferably water-cleaned or freed from dust and grit by other suitable means to prevent injury to the drill, and a great many changes might be made in the general form and arrangement of parts described without departing from my invention. Hence I do not restrict myself to theprecise details set forth,but consider myself at liberty to make suoli changes and alterations as fairly fall within the spirit and scope ofmy invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a drill, the combination with a barrel, of a drive-piston in the barrel, a driven piston in the barrel, and manually-controlled means for maintaining air at proper density between said pistons and` similar means for maintaining the air at proper density on the op osite sides of the pistons to compel the riven piston to move with the driver.

f 2. In a drill, the combination with a barrel, of a drive-piston in the barrel, a driven piston in the barrel,- means for supplying air between the pistons and at both sides of said pistons to compel them to move together, and devices for controlling the supply of air to the different air-chambers, to adjust the driven piston toward or away from the driver.

3. In a drill, the combination with a barrel, driving and driven pistons therein and separated by an air-chamber, and means for reciprocating the driving-piston, of means for forcing air into the chamber between the pistons and simultaneously in front of one piston and behind the other for maintaining the air at proper density between and in front of and behind the pistons, and means for overcoming excessive pressure.

4. In a drill,.the combination with a driving-piston, of a driven piston, air-chambers between and on both sides of both pistons, a duct connecting the end chambers, and insane for forcing air into all of said chamers.

5. In a drill, the combination of a drillbarrel, a drive-piston therein, a driven piston in the barrel, air-chambers between and at both sides of both pistons, an air-duct connecting the end chambers, and a pumpl operated by the drill to supply compressed air to all of said air-chambers.

6. In a drill, the combination with a drillbarrel, of a drive-piston in the barrel, a driven piston in the barrel, and a pump operated by the drill to force air into the barrel and serve as a connecting medium between the pistons. 7. 4In a drill, the combination with a drillbarrel, of a drive-piston therein, a driven piston in the barrel, an airum ,ducts connecting the pump with the c iam ers between the pistons and on both sides thereof, a reciprocating draw-bar connected with the drivepiston, and a plunger in the pump connectedl with the draw-bar.

8. In a drill, the combination with a drillbarrel, of a drive-piston therein, a driven piston in the barrel and air-chambers between and on both sides of said pistons, an air-pump at the rear end of the drill-barrel and. operated by the drill, air-duets connecting the airchambers with the )ump, check-valves in said airassages and1 a pressure relief-valve in one o said passages.

9, In a drill, the combination with a drillbarrel, of drive and driven pistons dividing the barrel, to three air-chambers, a duct connecting he end chambers, an air-pump o erated by the drill to force air into all of t e air-chambers, means for regulating the supply of air to the chambers and a pressure relief-valve.

10, In a drill, the combination with a drillbarrel, of drive and driven pistons in the barrel spaced a art and forming three air-chambers in they arrel, a duct connecting the end air-chambers, drill-driving mechanism, an

roo

barrel, Vair-passages connecting air-pum operated by the drill-driving mechanism, c eck-valves, means for ad'usting the check-valves, and a pressure relief-valve operated by pressure in the air-chambers.

11. In a drill, the combination with a barrel, of drive and driven pistons in the barrel spaced apart, an air-pump, plug-valves in the .au-passages between the pump and chambers formed by the pistons, check-valves in the plu -valves, and a spring holding one plug-va ve down and permltting the same to operate as a 'pressure relief-valve.

' 12. In a drill, the combination with a barrel and a removable back door thereon, of drive and driven istons in the barrel forming air-chambers letWeen and at both sides thereof, an airump in the back door operated by the dri l and receiving air from the the pump with the air-chambers, lug-valves in said passages having check-va ves therein, a duct returning air from the pump to the barrel When one of said plug-valves is moved to close its air-passage to the chambers, and the other plug-valve serving as a pressure relief- ,valve as Well as a turnm -plug. K

' 13. In a drill, the combmation with a drillbarrel, a drill-rod, a driven iston in the barrel connected with the dril -rod, said piston having a chamber, therein and havin outletport's communicating with said cham er, and

means for forcing fluid through said chamber and forwardly through the ports to move the' piston rearwardly. 14. lIn a drill, the combination with a drillbarrel, and a drill-rod, of a piston movable s in the barrel and connected with the drillrod, said vpiston having a chamber ltherein,

means for forcing air into said chamber, said piston also having forward ports communicatmg with said chamber and a valve on the forward face of the piston covering said ports.

15. In a drill, the combination with a drillbarrel, of a driving-piston and a driven piston in said barrel and se arated from each other, a drill-rod connected with the driven piston, means for supplying air between said pistons and means for suppl in air in front of the driven piston when t 1e attcr passes beyond the forward end of its normal throw.

16. In a drill, the combination with a drillbarrel, of a driving and a driven piston therein separated by an air-space, means for operating the drivingiston to operate the driven piston in both irections, a drill-rod connected with the'driven piston, and means for supplying air in front of the driven piston whlenxit passes the forward end of its normal t ow.

17. In a drin, the Combination with a drin;

barrel having a compartment therein, of a drlven piston in said compartment, a drillrod connected with said piston, means for reciprocating the piston, and means operatingA automatically to supply air between said piston and the forward end of the compartment in which it moves if the piston passes beyond the forward end of its normal throw in said compartment.

vIn testimony' whereof I have signed this specification in the presence of two subscribing Witnesses. THOMAS EDGAR ADAMS.

, Witnesses z' F. W. SINRAM,

J. H. WoRBs. 

